Add dry ingredients to mug mix wll with a fork. Add egg, mix thoroughly. Pour in milk ,oil and vanilla, mix well. Add chips if wanted) Put mug in microwave and cook for 3 minutes on 1000 watts microwave a little longer if you have a different wattage microwave. Cake will rise over the top of mug- Do not be alarm. Allow to cool a little; tip onto plate if desired. I usually eat it straight from the mug. I dip my spoon in icing and then dig into the cake and so on and so on. The reason its dangerous is you can now have chocolate cake anytime you want. I usually make up bags of the dry mix ingredients and then add the wet stuff whenever I want some cake!